Re: [PATCH 1/3] hwmon: (pmbus) Add driver for Delta DPS-920AB PSU

From: Robert Marko
Date: Thu May 27 2021 - 06:59:17 EST

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On Thu, May 27, 2021 at 12:22 PM Robert Marko <robert.marko@xxxxxxxxxx> wrote:
>
> On Mon, May 24, 2021 at 3:47 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> >
> > On 5/24/21 5:21 AM, Robert Marko wrote:
> > > On Fri, May 21, 2021 at 4:46 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> > >>
> > >> On 5/21/21 4:56 AM, Robert Marko wrote:
> > >>> On Fri, May 21, 2021 at 12:56 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> > >>>>
> > >>>> On 5/21/21 1:36 AM, Robert Marko wrote:
> > >>>>> On Wed, May 19, 2021 at 3:19 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> > >>>>>>
> > >>>>>> On 5/19/21 5:38 AM, Robert Marko wrote:
> > >>>>>>> On Fri, Apr 30, 2021 at 3:48 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
> > >>>>>>>>
> > >>>>>>>> On Fri, Apr 30, 2021 at 03:27:33PM +0200, Robert Marko wrote:
> > >>>>>>>>> This adds support for the Delta DPS-920AB PSU.
> > >>>>>>>>>
> > >>>>>>>>> Only missing feature is fan control which the PSU supports.
> > >>>>>>>>>
> > >>>>>>>>> Signed-off-by: Robert Marko <robert.marko@xxxxxxxxxx>
> > >>>>>>>>> ---
> > >>>>>>>>> Documentation/hwmon/dps920ab.rst | 80 ++++++++++++++++++++++++++++++++
> > >>>>>>>>> Documentation/hwmon/index.rst | 1 +
> > >>>>>>>>> drivers/hwmon/pmbus/Kconfig | 9 ++++
> > >>>>>>>>> drivers/hwmon/pmbus/Makefile | 1 +
> > >>>>>>>>> drivers/hwmon/pmbus/dps920ab.c | 63 +++++++++++++++++++++++++
> > >>>>>>>>> 5 files changed, 154 insertions(+)
> > >>>>>>>>> create mode 100644 Documentation/hwmon/dps920ab.rst
> > >>>>>>>>> create mode 100644 drivers/hwmon/pmbus/dps920ab.c
> > >>>>>>>>>
> > >>>>>>>>> diff --git a/Documentation/hwmon/dps920ab.rst b/Documentation/hwmon/dps920ab.rst
> > >>>>>>>>> new file mode 100644
> > >>>>>>>>> index 000000000000..df0aef530c7e
> > >>>>>>>>> --- /dev/null
> > >>>>>>>>> +++ b/Documentation/hwmon/dps920ab.rst
> > >>>>>>>>> @@ -0,0 +1,80 @@
> > >>>>>>>>> +.. SPDX-License-Identifier: GPL-2.0-or-later
> > >>>>>>>>> +
> > >>>>>>>>> +Kernel driver dps920ab
> > >>>>>>>>> +========================
> > >>>>>>>>> +
> > >>>>>>>>> +Supported chips:
> > >>>>>>>>> +
> > >>>>>>>>> + * Delta DPS920AB
> > >>>>>>>>> +
> > >>>>>>>>> + Prefix: 'dps920ab'
> > >>>>>>>>> +
> > >>>>>>>>> + Addresses scanned: -
> > >>>>>>>>> +
> > >>>>>>>>> +Authors:
> > >>>>>>>>> + Robert Marko <robert.marko@xxxxxxxxxx>
> > >>>>>>>>> +
> > >>>>>>>>> +
> > >>>>>>>>> +Description
> > >>>>>>>>> +-----------
> > >>>>>>>>> +
> > >>>>>>>>> +This driver implements support for Delta DPS920AB 920W 54V DC single output
> > >>>>>>>>> +power supply with PMBus support.
> > >>>>>>>>> +
> > >>>>>>>>> +The driver is a client driver to the core PMBus driver.
> > >>>>>>>>> +Please see Documentation/hwmon/pmbus.rst for details on PMBus client drivers.
> > >>>>>>>>> +
> > >>>>>>>>> +
> > >>>>>>>>> +Usage Notes
> > >>>>>>>>> +-----------
> > >>>>>>>>> +
> > >>>>>>>>> +This driver does not auto-detect devices. You will have to instantiate the
> > >>>>>>>>> +devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
> > >>>>>>>>> +details.
> > >>>>>>>>> +
> > >>>>>>>>> +
> > >>>>>>>>> +Sysfs entries
> > >>>>>>>>> +-------------
> > >>>>>>>>> +
> > >>>>>>>>> +======================= ======================================================
> > >>>>>>>>> +curr1_label "iin"
> > >>>>>>>>> +curr1_input Measured input current
> > >>>>>>>>> +curr1_crit Critical maximum current
> > >>>>>>>>> +curr1_crit_alarm Current critical high alarm
> > >>>>>>>>> +
> > >>>>>>>>> +curr2_label "iout1"
> > >>>>>>>>> +curr2_input Measured output current
> > >>>>>>>>> +curr2_crit Critical maximum current
> > >>>>>>>>> +curr2_crit_alarm Current critical high alarm
> > >>>>>>>>> +
> > >>>>>>>>> +in1_label "vin"
> > >>>>>>>>> +in1_input Measured input voltage
> > >>>>>>>>> +in1_lcrit Critical minimum input voltage
> > >>>>>>>>> +in1_lcrit_alarm Input voltage critical low alarm
> > >>>>>>>>> +in1_crit Critical maximum input voltage
> > >>>>>>>>> +in1_crit_alarm Input voltage critical high alarm
> > >>>>>>>>> +
> > >>>>>>>>> +in2_label "vout1"
> > >>>>>>>>> +in2_input Measured output voltage
> > >>>>>>>>> +in2_lcrit Critical minimum output voltage
> > >>>>>>>>> +in2_lcrit_alarm Output voltage critical low alarm
> > >>>>>>>>> +in2_crit Critical maximum output voltage
> > >>>>>>>>> +in2_crit_alarm Output voltage critical high alarm
> > >>>>>>>>> +
> > >>>>>>>>> +power1_label "pin"
> > >>>>>>>>> +power1_input Measured input power
> > >>>>>>>>> +power1_alarm Input power high alarm
> > >>>>>>>>> +
> > >>>>>>>>> +power2_label "pout1"
> > >>>>>>>>> +power2_input Measured output power
> > >>>>>>>>> +
> > >>>>>>>>> +temp[1-2]_input Measured temperature
> > >>>>>>>>> +temp[1-2]_crit Critical high temperature
> > >>>>>>>>> +temp[1-2]_crit_alarm Chip temperature critical high alarm
> > >>>>>>>>> +temp[1-2]_max Maximum temperature
> > >>>>>>>>> +temp[1-2]_max_alarm Chip temperature high alarm
> > >>>>>>>>> +
> > >>>>>>>>> +fan1_alarm Fan 1 warning.
> > >>>>>>>>> +fan1_fault Fan 1 fault.
> > >>>>>>>>> +fan1_input Fan 1 speed in RPM.
> > >>>>>>>>> +======================= ======================================================
> > >>>>>>>>> diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
> > >>>>>>>>> index 8d5a2df1ecb6..b24436f22052 100644
> > >>>>>>>>> --- a/Documentation/hwmon/index.rst
> > >>>>>>>>> +++ b/Documentation/hwmon/index.rst
> > >>>>>>>>> @@ -54,6 +54,7 @@ Hardware Monitoring Kernel Drivers
> > >>>>>>>>> dell-smm-hwmon
> > >>>>>>>>> dme1737
> > >>>>>>>>> drivetemp
> > >>>>>>>>> + dps920ab
> > >>>>>>>>> ds1621
> > >>>>>>>>> ds620
> > >>>>>>>>> emc1403
> > >>>>>>>>> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> > >>>>>>>>> index 32d2fc850621..865ade0aa205 100644
> > >>>>>>>>> --- a/drivers/hwmon/pmbus/Kconfig
> > >>>>>>>>> +++ b/drivers/hwmon/pmbus/Kconfig
> > >>>>>>>>> @@ -66,6 +66,15 @@ config SENSORS_IBM_CFFPS
> > >>>>>>>>> This driver can also be built as a module. If so, the module will
> > >>>>>>>>> be called ibm-cffps.
> > >>>>>>>>>
> > >>>>>>>>> +config SENSORS_DPS920AB
> > >>>>>>>>> + tristate "Delta DPS920AB Power Supply"
> > >>>>>>>>> + help
> > >>>>>>>>> + If you say yes here you get hardware monitoring support for Delta
> > >>>>>>>>> + DPS920AB Power Supplies.
> > >>>>>>>>> +
> > >>>>>>>>> + This driver can also be built as a module. If so, the module will
> > >>>>>>>>> + be called dps920ab.
> > >>>>>>>>> +
> > >>>>>>>>> config SENSORS_INSPUR_IPSPS
> > >>>>>>>>> tristate "INSPUR Power System Power Supply"
> > >>>>>>>>> help
> > >>>>>>>>> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> > >>>>>>>>> index 6a4ba0fdc1db..f59ba0123d68 100644
> > >>>>>>>>> --- a/drivers/hwmon/pmbus/Makefile
> > >>>>>>>>> +++ b/drivers/hwmon/pmbus/Makefile
> > >>>>>>>>> @@ -9,6 +9,7 @@ obj-$(CONFIG_SENSORS_ADM1266) += adm1266.o
> > >>>>>>>>> obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o
> > >>>>>>>>> obj-$(CONFIG_SENSORS_BEL_PFE) += bel-pfe.o
> > >>>>>>>>> obj-$(CONFIG_SENSORS_IBM_CFFPS) += ibm-cffps.o
> > >>>>>>>>> +obj-$(CONFIG_SENSORS_DPS920AB) += dps920ab.o
> > >>>>>>>>> obj-$(CONFIG_SENSORS_INSPUR_IPSPS) += inspur-ipsps.o
> > >>>>>>>>> obj-$(CONFIG_SENSORS_IR35221) += ir35221.o
> > >>>>>>>>> obj-$(CONFIG_SENSORS_IR38064) += ir38064.o
> > >>>>>>>>> diff --git a/drivers/hwmon/pmbus/dps920ab.c b/drivers/hwmon/pmbus/dps920ab.c
> > >>>>>>>>> new file mode 100644
> > >>>>>>>>> index 000000000000..d579ed9f879c
> > >>>>>>>>> --- /dev/null
> > >>>>>>>>> +++ b/drivers/hwmon/pmbus/dps920ab.c
> > >>>>>>>>> @@ -0,0 +1,63 @@
> > >>>>>>>>> +// SPDX-License-Identifier: GPL-2.0-or-later
> > >>>>>>>>> +/*
> > >>>>>>>>> + * Driver for Delta DPS920AB PSU
> > >>>>>>>>> + *
> > >>>>>>>>> + * Copyright (C) 2021 Delta Networks, Inc.
> > >>>>>>>>> + * Copyright (C) 2021 Sartura Ltd.
> > >>>>>>>>> + */
> > >>>>>>>>> +
> > >>>>>>>>> +#include <linux/i2c.h>
> > >>>>>>>>> +#include <linux/module.h>
> > >>>>>>>>> +#include <linux/of_device.h>
> > >>>>>>>>> +#include "pmbus.h"
> > >>>>>>>>> +
> > >>>>>>>>> +static struct pmbus_driver_info dps920ab_info = {
> > >>>>>>>>> + .pages = 1,
> > >>>>>>>>> +
> > >>>>>>>>> + .format[PSC_VOLTAGE_IN] = linear,
> > >>>>>>>>> + .format[PSC_VOLTAGE_OUT] = linear,
> > >>>>>>>>> + .format[PSC_CURRENT_IN] = linear,
> > >>>>>>>>> + .format[PSC_CURRENT_OUT] = linear,
> > >>>>>>>>> + .format[PSC_POWER] = linear,
> > >>>>>>>>> + .format[PSC_FAN] = linear,
> > >>>>>>>>> + .format[PSC_TEMPERATURE] = linear,
> > >>>>>>>>> +
> > >>>>>>>>> + .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
> > >>>>>>>>> + PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
> > >>>>>>>>> + PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
> > >>>>>>>>> + PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
> > >>>>>>>>> + PMBUS_HAVE_PIN | PMBUS_HAVE_POUT |
> > >>>>>>>>> + PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12 |
> > >>>>>>>>> + PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
> > >>>>>>>>> +};
> > >>>>>>>>> +
> > >>>>>>>>> +static int dps920ab_probe(struct i2c_client *client)
> > >>>>>>>>> +{
> > >>>>>>>>> + if (!i2c_check_functionality(client->adapter,
> > >>>>>>>>> + I2C_FUNC_SMBUS_BYTE_DATA |
> > >>>>>>>>> + I2C_FUNC_SMBUS_WORD_DATA))
> > >>>>>>>>> + return -ENODEV;
> > >>>>>>>>
> > >>>>>>>> This check is done in pmbus_do_probe(), and repeating it here does not add
> > >>>>>>>> any value.
> > >>>>>>>
> > >>>>>>> Ok, makes sense.
> > >>>>>>>>
> > >>>>>>>> That makes me wonder: Is this driver needed in the first place, or could
> > >>>>>>>> it be added to drivers/hwmon/pmbus/pmbus.c ?
> > >>>>>>>
> > >>>>>>> It could be added as a generic driver, but that creates properties in
> > >>>>>>> the sysfs that this thing
> > >>>>>>> does not support like 3 voltage readings, 3 fans, and so on.
> > >>>>>>>
> > >>>>>>
> > >>>>>> Can you be more specific ? What additional unsupported attributes
> > >>>>>> are added, and why ? Are you saying the PSU reports registers as
> > >>>>>> existing which do not really exist ? If so, which registers are those ?
> > >>>>>
> > >>>>> Sure, when core does probing and autodiscovery, then the following
> > >>>>> sysfs attributes are created:
> > >>>>>>
> > >>>>>> curr1_crit fan3_fault in3_min_alarm temp1_max
> > >>>>>> curr1_crit_alarm fan3_input in3_rated_max temp1_max_alarm
> > >>>>>> curr1_input fan3_target in3_rated_min temp1_min
> > >>>>>> curr1_label in1_crit name temp1_min_alarm
> > >>>>>> curr1_max in1_crit_alarm of_node temp1_rated_max
> > >>>>>> curr1_max_alarm in1_input power temp2_crit
> > >>>>>> curr1_rated_max in1_label power1_alarm temp2_crit_alarm
> > >>>>>> curr2_crit in1_lcrit power1_input temp2_input
> > >>>>>> curr2_crit_alarm in1_lcrit_alarm power1_label temp2_lcrit
> > >>>>>> curr2_input in1_max power1_max temp2_lcrit_alarm
> > >>>>>> curr2_label in1_max_alarm power1_rated_max temp2_max
> > >>>>>> curr2_lcrit in1_min power2_cap temp2_max_alarm
> > >>>>>> curr2_lcrit_alarm in1_min_alarm power2_cap_alarm temp2_min
> > >>>>>> curr2_max in1_rated_max power2_crit temp2_min_alarm
> > >>>>>> curr2_max_alarm in1_rated_min power2_crit_alarm temp2_rated_max
> > >>>>>> curr2_rated_max in2_input power2_input temp3_crit
> > >>>>>> device in2_label power2_label temp3_crit_alarm
> > >>>>>> fan1_alarm in3_crit power2_max temp3_input
> > >>>>>> fan1_fault in3_crit_alarm power2_max_alarm temp3_lcrit
> > >>>>>> fan1_input in3_input power2_rated_max temp3_lcrit_alarm
> > >>>>>> fan1_target in3_label subsystem temp3_max
> > >>>>>> fan2_alarm in3_lcrit temp1_crit temp3_max_alarm
> > >>>>>> fan2_fault in3_lcrit_alarm temp1_crit_alarm temp3_min
> > >>>>>> fan2_input in3_max temp1_input temp3_min_alarm
> > >>>>>> fan2_target in3_max_alarm temp1_lcrit temp3_rated_max
> > >>>>>> fan3_alarm in3_min temp1_lcrit_alarm uevent
> > >>>>>
> > >>>>> The following return -1, or -500 so they are not supported.
> > >>>>> * fan2
> > >>>>> * in2
> > >>>>>
> > >>>>> Weirdly, with the external driver both fan2 and in2 are enabled and work fine,
> > >>>>> but when auto probing they are fan3 and in3.
> > >>>>>
> > >>>>> temp3 actually seems to return a valid temperature despite it not being used in
> > >>>>> the vendor driver that features were picked from.
> > >>>>>
> > >>>>
> > >>>> Can you run "grep . *" in the hwmon directory so I can see actual values ?
> > >>>>
> > >>> Sure:
> > >>>>
> > >>>> curr1_crit:-500
> > >>>> curr1_crit_alarm:0
> > >>>> curr1_input:195
> > >>>> curr1_label:iin
> > >>>> curr1_max:-500
> > >>>> curr1_max_alarm:0
> > >>>> curr1_rated_max:-500
> > >>>> curr2_crit:-500
> > >>>> curr2_crit_alarm:0
> > >>>> curr2_input:320
> > >>>> curr2_label:iout1
> > >>>> curr2_lcrit:-500
> > >>>> curr2_lcrit_alarm:0
> > >>>> curr2_max:18625
> > >>>> curr2_max_alarm:0
> > >>>> curr2_rated_max:16875
> > >>>> grep: device: Is a directory
> > >>>> fan1_alarm:0
> > >>>> fan1_fault:0
> > >>>> fan1_input:10000
> > >>>> fan1_target:0
> > >>>> fan2_alarm:1
> > >>>> fan2_fault:1
> > >>>> fan2_input:-1
> > >>>> fan2_target:-1
> > >>>> fan3_alarm:1
> > >>>> fan3_fault:1
> > >>>> fan3_input:-1
> > >>>> fan3_target:-1
> > >>>> in1_crit:-500
> > >>>> in1_crit_alarm:0
> > >>>> in1_input:245250
> > >>>> in1_label:vin
> > >>>> in1_lcrit:-500
> > >>>> in1_lcrit_alarm:0
> > >>>> in1_max:-500
> > >>>> in1_max_alarm:0
> > >>>> in1_min:-500
> > >>>> in1_min_alarm:0
> > >>>> in1_rated_max:-500
> > >>>> in1_rated_min:-500
> > >>>> in2_input:-500
> > >>>> in2_label:vcap
> > >>>> in3_crit:255996
> > >>>> in3_crit_alarm:0
> > >>>> in3_input:54511
> > >>>> in3_label:vout1
> > >>>> in3_lcrit:255996
> > >>>> in3_lcrit_alarm:0
> > >>>> in3_max:255996
> > >>>> in3_max_alarm:0
> > >>>> in3_min:255996
> > >>>> in3_min_alarm:0
> > >>>> in3_rated_max:56136
> > >>>> in3_rated_min:52863
> > >>>> name:dps920ab
> > >>>> grep: of_node: Is a directory
> > >>>> grep: power: Is a directory
> > >>>> power1_alarm:0
> > >>>> power1_input:33250000
> > >>>> power1_label:pin
> > >>>> power1_max:-500000
> > >>>> power1_rated_max:-500000
> > >>>> power2_cap:-500000
> > >>>> power2_cap_alarm:0
> > >>>> power2_crit:-500000
> > >>>> power2_crit_alarm:0
> > >>>> power2_input:17750000
> > >>>> power2_label:pout1
> > >>>> power2_max:-500000
> > >>>> power2_max_alarm:0
> > >>>> power2_rated_max:920000000
> > >>>> grep: subsystem: Is a directory
> > >>>> temp1_crit:-500
> > >>>> temp1_crit_alarm:0
> > >>>> temp1_input:23000
> > >>>> temp1_lcrit:-500
> > >>>> temp1_lcrit_alarm:0
> > >>>> temp1_max:-500
> > >>>> temp1_max_alarm:0
> > >>>> temp1_min:-500
> > >>>> temp1_min_alarm:0
> > >>>> temp1_rated_max:-500
> > >>>> temp2_crit:-500
> > >>>> temp2_crit_alarm:0
> > >>>> temp2_input:26000
> > >>>> temp2_lcrit:-500
> > >>>> temp2_lcrit_alarm:0
> > >>>> temp2_max:-500
> > >>>> temp2_max_alarm:0
> > >>>> temp2_min:-500
> > >>>> temp2_min_alarm:0
> > >>>> temp2_rated_max:-500
> > >>>> temp3_crit:-500
> > >>>> temp3_crit_alarm:0
> > >>>> temp3_input:30000
> > >>>> temp3_lcrit:-500
> > >>>> temp3_lcrit_alarm:0
> > >>>> temp3_max:-500
> > >>>> temp3_max_alarm:0
> > >>>> temp3_min:-500
> > >>>> temp3_min_alarm:0
> > >>>> temp3_rated_max:-500
> > >>>> uevent:OF_NAME=psu
> > >>>> uevent:OF_FULLNAME=/ap806/config-space@f0000000/i2c@511000/psu@5a
> > >>>> uevent:OF_COMPATIBLE_0=delta,dps920ab
> > >>>> uevent:OF_COMPATIBLE_N=1
> > >>>
> > >> Ok, good enough. It looks like the PSU reports values for pretty much everything,
> > >> including registers which don't exist. With that in mind, please check
> > >> the attributes generated by your driver - I suspect that some of the limit
> > >> attributes are not really supported (maybe none of them is supported).
> > >
> > > Yeah, I also think that none of those limits are actually supported.
> > > Does the core expose a way to not register those?
> > >
> >
> > Have the read_word function return -ENXIO for unsupported registers
> > (and add a comment to the code explaining why you do that).
> > See drivers/hwmon/pmbus/fsp-3y.c for an example.
>
> Thanks, will implement that.
> In the meantime I finally got the PMBus command list that
> the PSU supports.
> It implements PMBus 1.2, but it also claims that MFR_ID,
> MFR_MODEL and MFR_REVISION are supported.
>
> Block read returns what looks like a correct length, but the buffer
> is empty.
> >
> > [ 195.246464] dps920ab 0-005a: PMBUS_MFR_ID length: 5
> > [ 195.251495] dps920ab 0-005a: PMBUS_MFR_ID:
> > [ 195.300789] dps920ab 0-005b: PMBUS_MFR_ID length: 5
> > [ 195.305762] dps920ab 0-005b: PMBUS_MFR_ID:
> > [ 272.795222] dps920ab 0-005a: PMBUS_MFR_ID length: 5
> > [ 272.800190] dps920ab 0-005a: PMBUS_MFR_ID:
> > [ 272.804862] dps920ab 0-005a: PMBUS_MFR_MODEL length: 11
> > [ 272.810172] dps920ab 0-005a: PMBUS_MFR_MODEL:
> > [ 272.815098] dps920ab 0-005a: PMBUS_MFR_REVISION length: 2
> > [ 272.820600] dps920ab 0-005a: PMBUS_MFR_REVISION:
> > [ 272.874060] dps920ab 0-005b: PMBUS_MFR_ID length: 5
> > [ 272.879102] dps920ab 0-005b: PMBUS_MFR_ID:
> > [ 272.883833] dps920ab 0-005b: PMBUS_MFR_MODEL length: 11
> > [ 272.889151] dps920ab 0-005b: PMBUS_MFR_MODEL:
> > [ 272.894097] dps920ab 0-005b: PMBUS_MFR_REVISION length: 2
> > [ 272.899548] dps920ab 0-005b: PMBUS_MFR_REVISION:
>
>
> However, manually reading using i2cget in word mode returns
> something that looks ok.
> i2cget -y 0 0x5a 0x9a w
> 0x440b
>
> This would be D is ASCII, it looks like any kind of block read fails actually.

Ok, so after using i2c_smbus_read_i2c_block_data() I can actually read
the model kind of OK.
There actually are 10 bytes of valid data, no idea why
i2c_smbus_read_block_data() does not work.
>
> [ 721.194706] dps920ab 0-005a: MFR MODEL:
> DPS-920AB
> [ 721.245502] dps920ab 0-005b: MFR MODEL:
> DPS-920AB

It behaves weirdly when printing by creating a newline before and
stuff like that.

Regards,
Robert

>
> I am now a bit confused.
> I tried applying the block support for mv64xx as well:
> https://patchwork.ozlabs.org/project/linux-i2c/patch/20200118115820.9080-1-fuga@xxxxxxxxxxxxxx/
>
> But no luck.
>
> Regards,
> Robert
> >
> > Guenter
>
>
>
> --
> Robert Marko
> Staff Embedded Linux Engineer
> Sartura Ltd.
> Lendavska ulica 16a
> 10000 Zagreb, Croatia
> Email: robert.marko@xxxxxxxxxx
> Web: www.sartura.hr

--
Robert Marko
Staff Embedded Linux Engineer
Sartura Ltd.
Lendavska ulica 16a
10000 Zagreb, Croatia
Email: robert.marko@xxxxxxxxxx
Web: www.sartura.hr

Next message: Rudi Heitbaum: "Re: [PATCH] regulator: fan53555: add back tcs4526"
Previous message: Marc Zyngier: "Re: [RFC PATCH v2 02/10] genirq: Define irq_ack() and irq_eoi() helpers"
In reply to: Robert Marko: "Re: [PATCH 1/3] hwmon: (pmbus) Add driver for Delta DPS-920AB PSU"
Next in thread: Guenter Roeck: "Re: [PATCH 1/3] hwmon: (pmbus) Add driver for Delta DPS-920AB PSU"
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